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More about Breguet 3817ST/X2/3ZU Type XXI Flyback SS Grey Dial

This is a stainless steel Breguet Type XXI Flyback 3817ST/X2/3ZU. It has a leather strap with a stainless steel deployment buckle, and a scratch resistant sapphire crystal. There is an exhibition sapphire display case back secured with 8 screws, and around the polished perimeter is engraved "BREGUET TYPE XXI – AUTOMATIQUE REF. 3817 – ETANCHE 10 BAR (100M)," and a serial number. The 42mm diameter solid three-body case, downturned lugs, and angled flat rotating unidirectional bezel are polished/brushed. The bezel has black engraved Arabic numeral ten-minute markers, with a luminous triangle at 12 o'clock. It has a screw-down winding crown with two round fly back chronograph pushbuttons. The dial is grey with cream colored luminous baton hands, Arabic numeral hour markers, luminous diamond-shaped indices at 3 and 9 o'clock, and a central sweep synchronized 24-hour hand that operates as an AM/PM indicator with a luminous arrow tip. There is a perimeter 60-minute/seconds scale with Arabic numerals every five minutes. It has three subsidiary dials, including a running seconds counter at 9 o'clock, a 12-hour totalizer at 3 o'clock, and a 24-hour register is at 6 o'clock, which is combined with a trapezoidal date aperture window at its 6 o'clock position. It's water resistant to 100 meters/330 feet, and there is a 48-hour power reserve at full wind. The 15.2mm thick case, dial, and movement are all signed.

This Breguet Type XXI Flyback 3817ST/X2/3ZU has an automatic Breguet caliber 584Q/2 chronograph movement, which includes an "inverted in-line Swiss lever" silicon escapement, 27 jewels, a self-compensating flat balance spring, and a 18k gold engraved rotor. The chronograph has central minutes and central seconds, with two centrally-mounted chronograph hands to measure both segments of time. The mechanism oscillates at a frequency of 28,800 vph (4Hz).

The Breguet Type XXI Flyback 3817ST/X2/3ZU was introduced at the BaselWorld fair in 2016.